Moisture content
In
the whole process of transformer production, transformer manufacturers
strictly control the moisture content of products. Generally,
transformers need to go through the whole process of water removal such
as gasoline liquid phase drying, vacuum pump oil pump, hot oil
circulation, etc., but there will still be a certain amount of moisture.
The moisture in the transformer mainly accumulates in the insulating
cardboard and transformer oil, which will reduce the electrical
properties of the transformer oil and the insulating cardboard, reduce
the electrical compressive strength, and the penetration compressive
strength will drop sharply with the increase of the moisture content. In
the middle and later stages of operation, especially when the cover is
repaired, it is inevitable that some moisture will invade, and the
transformer oil will also dissolve moisture after thermal aging. The
moisture in the body will continue to react with the insulating layer
material, accelerating the aging of the insulating layer material. The
results show that the aging rate of insulating paper with an ambient
humidity of 2% is 11 times that of an ambient humidity of 0.
Transformer oil aging
Transformer
oil can age slowly under the effects of electricity, heat and oxygen.
After the aging of the transformer oil, the level of gas digestion,
absorption and convergence of the transformer oil increases, resulting
in the increase of the gas and viscosity in the oil.
The
increase of operating viscosity will affect the heat convection and
heat conduction capacity of the circulating system of the transformer.
It cannot be integrated into the operating standards of the transformer,
resulting in a vicious cycle, which will seriously affect the operating
life of the transformer and even lead to safety accidents of machinery
and equipment.
Influence of external natural forces
External factors such as wind, heavy rain, snow, hail, and earthquake disasters will also affect the service life of the transformer.
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